14C in Extractives from Wood
14C in Extractives from Wood
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木材提取物中的 14C
DOI：
10.1017/s0033822200009838
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发表时间：
1980
期刊：
影响因子：
8.3
通讯作者：
I. Olsson
中科院分区：
文献类型：
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作者：
I. Olsson
C W Ferguson 提交的两个赤松样品被分离成不同的部分，就像之前对瑞典的西松所做的那样，以产生不同的部分用于预处理研究。这个新系列中的一个样品由心材组成，第二个样品由边材组成。在放射性碳实验室进行的处理包括煮沸酸处理、洗涤、80℃的氢氧化物处理、洗涤，最后在燃烧前进行干燥之前的另一次酸处理。重复氢氧化钠处理以产生至少两种可溶性级分和两种不溶性级分。木材化学家进行的处理涉及用乙醇-苯和水进行提取。剩余的木材已过时，但也用于生产全纤维素。提取物在乙醚和水之间分配，老木材中的提取物用于分离中性物质、酸和酚。总共，这两个木材样本的 19 个部分已被测年。已证实，在 80°C 的氢氧化钠中处理 30 分钟不足以去除心材或边材中的提取物。用 1% NaOH 在 80°C 下处理过夜，从老木材中得到了 14C 含量的样品，与 Stuiver (1978) 提出的曲线预测的结果非常一致。本次调查的最终统计不确定性约为 4‰。较年轻的木材产生的结果表明其活性低于 Stuiver 给出的结果。
Two Pinus aristata samples submitted by C W Ferguson were separated in different fractions, as was done earlier with Pinus silvestris L from Sweden, to yield different fractions for studies of the pretreatment. One sample in this new series consisted of heartwood and the second of sapwood. The treatment performed in the radiocarbon laboratory involved an acid treatment by boiling, washings, an hydroxide treatment at 80°C, washings and, finally, another acid treatment before being dried before the combustion. The sodium-hydroxide treatment was repeated to yield at least two soluble and two insoluble fractions. The treatment performed by the wood chemists involved extractions with ethanol-benzene and water. The remaining wood was dated but was also used for the production of holocellulose. The extractives were partitioned between ethyl ether and water and that from the older wood was used for the isolation of neutrals, acids, and phenols. In all, 19 fractions of these two wood samples were dated. It is confirmed that a treatment for 30 min in sodium hydroxide at 80°C is not sufficient to remove the extractives from the heartwood or the sapwood. A treatment at 80°C overnight with 1 percent NaOH yielded a sample from the older wood with a 14C content in good agreement with the results predicted from the curve presented by Stuiver (1978). The final statistical uncertainty in the present investigation was ca 4‰. The younger wood yielded results indicating a lower activity than that given by Stuiver.